System and method for human body communication using limited passband

A receiver in a human body communication system, comprising:

• a reception processing means for demodulating a limited passband signal received through a human body channel into a baseband signal;
• a de-spreading means for recovering symbol data by de-spreading the demodulated reception baseband signal;
• a symbol de-mapping means for de-mapping symbol data recovered in the despreading means into a data bit;
• and
• a transmission frame processing means for human body communication which divides the transmission frame for human body communication outputted in the symbol de-mapping means into a preamble, a header, and data, extracts user identification (ID) from the header, and de-scrambles the divided data into the orthogonal code generated by the user ID.

A method for transmitting human body communication data using a limited passband which is applied to a human body communication system, comprising the steps of:

• a) receiving data to be transmitted to outside through a human body channel and data information including user identification (ID) from a Medium Access Control (MAC) processing unit;
• b) scrambling the data by using an orthogonal code generated by the user ID;
• c) generating a transmission frame for human body communication based on the data information and the scrambled data;
• d) symbolizing the generated transmission frame for human body communication according to a predetermined modulating method;
• e) spreading the symbol generated in the step d);
• and
• f) generating a passband signal limited within a frequency range where a human body minimizes an effect of interference while maintaining a waveguide characteristic on the data spread in the step e), and transmitting the passband signal to a human body channel.

A method for receiving human body communication data using a limited passband which is applied to a human body communication system, comprising the steps of:

• a) demodulating a limited passband signal received through a human body channel into a baseband signal;
• b) de-spreading the demodulated reception baseband signal and recovering symbol data;
• c) de-mapping the symbol data recovered in the step b) into data bits;
• d) dividing the transmission frame for human body communication recovered in the step c) into data information and data, and extracting user identification (ID) from the divided data information;
• and
• e) generating an orthogonal code by the extracted user ID and de-scrambling and recovering the divided data into the orthogonal code.